The History of SIGINT in the Central Intelligence Agency, 1947-70
The pdf file, as released by the CIA and posted here, is a mess. Pages are not in chronological order, nor in order of which of the four volumes they belong to. In addition, it is likely that a significant number of pages have been withheld in their entirety, including some pages from the various tables of contents. Anyone with the patience to try to piece together the various documents is invited to do so, post them online, and post a link as a comment on this document.
ADDENDUM (4/1/15): The National Security Archive (NSA) has provided a very useful overview of this subject here, with links to additional documents as well: http://nsarchive.gwu.edu/NSAEBB/NSAEBB506/. Unfortunately, the CIA released the same version of this report to the NSA, with all the report's confusing disorder intact. The NSA describes the document this way: "This multi-volume, heavily redacted, history contains some discussion of actual SIGINT collection activities, but devotes more attention to the CIA's access to COMINT, the SIGINT authorities of the agency and DCI, CIA organizational issues with regard to SIGINT, and the impact of review committees and Intelligence Community bodies responsible for managing aspects of SIGINT activity."
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